package com.changgou;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Objects;

/**
 * @author ：hushengjin
 */

@SpringBootApplication
@EnableEurekaClient
public class GatewayWebApplication {

    public static void main(String[] args) {
        SpringApplication.run(GatewayWebApplication.class, args);
    }

    /**
     * IP限流
     * 根据用户的IP来进行限流
     * 把用户的IP作为令牌桶的唯一标识符
     *
     * @return
     */
    @Bean(name = "ipKeyResolver")
    public KeyResolver userKeyResolver() {
        return new KeyResolver() {
            @Override
            public Mono<String> resolve(ServerWebExchange exchange) {
                //获取远程客户端IP
                String hostString = Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getHostString();
                return Mono.just(hostString);
            }
        };
    }

}
